单项选择题

A．4,000 years ago.
B．3,000 years ago.
C．2,000 years ago.
D．1,000 years ago.
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单项选择题
A．She’s in a meeting.B．She’s out of the office.C．She’s talking with another customer.D．She’s spending her holiday.
A．She’s in a meeting.
B．She’s out of the office.
C．She’s talking with another customer.
D．She’s spending her holiday.
填空题
Escaping hot volcanic gas at these vents results in a sunless but ______.
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